Find the Value for the Function $f ( 2 x )$

Multiple Choice

Find the value for the function.
-Find $f ( 2 x )$ when $f ( x ) = \sqrt { 2 x ^ { 2 } - 7 x }$

A) $\sqrt { 4 x ^ { 2 } - 14 x }$
B) $\sqrt { 4 x ^ { 2 } - 28 x }$
C) $\sqrt { 8 x ^ { 2 } - 14 x }$
D) $2 \sqrt { 2 x ^ { 2 } - 7 x }$